115 and at the expense of the Contractor in accordance with ASTM C39. Test specimens will be evaluated separately, by the Engineer for meeting strength level requirements for each with CONCRETE QUALITY of ACI 318. The standard age of test shall be 28 days, but 7 days tests may be used, with the permission of the Engineer, provided that the relation between the 7-day and 28- day strengths on the concrete is established by tests for the materials and proportions used. When samples fail to conform to the requirements for strength, the Engineer shall have the right to order a change in the proportions of the concrete mix for the remaining portions of the work at no additional cost to the Government. Test of Hardened Concrete in or Removed from the Structure: When the result of the strength tests of the control specimens indicates in the concrete as placed does not meet the Specifications requirements or where there is other evidence that the quality of the concrete is below the specification requirements, test on core of in-place concrete shall be made in conformance with ASTM C 42. a. Core specimens shall be obtained by the Contractor and shall be tested. Any deficiency shall be corrected; if the Contractor elects, he may submit a proposal for approval that a load test is made. If the proposal is approved, the Contractor and the test results evaluated by the Engineer in conformance with 20 of ACI 318 shall make the load test. The cost of the load tests shall be borne by the Contractor. If any concrete shows evidence of failure during the load test or fails the load test as evaluated the deficiency shall be corrected in a manner approved by the Engineer at no additional cost to the Government. Admixtures: All admixtures shall be tested and those that have been in storage at the project Site for longer than 6 months shall not be used until proved by retest to be satisfactory. a. Air-Entraining Admixtures: Tested for conformance to the referenced specification under which it is furnished. The testing shall be conducted with cement and aggregate proposed for the project. b. Other admixtures if approved, tested for conformance to the referenced specifications under which it is furnished. The testing shall be conducted with cement and aggregate proposed for the Project. 405.7 STORAGE Storage accommodation for concrete materials shall be subject to approval and shall afford easy access for inspection and identification of each shipment in accordance with test reports. Cement: Immediate upon receipt at the Site, the Cement shall be stored separately in a dry weather tight, properly ventilated structure, with of adequate provisions for prevention or absorption of moisture. Cement bags should not be stacked more than 13 bags high. The cement most likely to have been exposed to moisture or stored in bags for more than 3 months shall not be used unless proven by test to be in good condition. Aggregate: Stored to assure good drainage, to preclude inclusion of foreign matter, and to preserve the gradation. 405.8 FORMWORK Forms: Designed, constructed, and maintained so as to insure that, after removal, the finished concrete members will have true surfaces, free of offset, waving or bulges, and will conform accurately to the indicated shapes, dimensions, .lines,
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and at the expense of the Contractor in accordance with ASTM C39. Test specimens will be evaluated separately, by the Engineer for meeting strength level requirements for each with CONCRETE QUALITY of ACI 318. The standard age of test shall be 28 days, but 7 days tests may be used, with the permission of the Engineer, provided that the relation between the 7-day and 28-day strengths on the concrete is established by tests for the materials and proportions used. When samples fail to conform to the requirements for strength, the Engineer shall have the right to order a change in the proportions of the concrete mix for the remaining portions of the work at no additional cost to the Government.
Test of Hardened Concrete in or Removed from the Structure: When the result of the strength
tests of the control specimens indicates in the concrete as placed does not meet the Specifications requirements or where there is other evidence that the quality of the concrete is below the specification requirements, test on core of in-place concrete shall be made in conformance with ASTM C 42.
a. Core specimens shall be obtained by the Contractor and shall be tested. Any
deficiency shall be corrected; if the Contractor elects, he may submit a proposal for approval that a load test is made. If the proposal is approved, the Contractor and the test results evaluated by the Engineer in conformance with 20 of ACI 318 shall make the load test. The cost of the load tests shall be borne by the Contractor. If any concrete shows evidence of failure during the load test or fails the load test as evaluated the deficiency shall be corrected in a manner approved by the Engineer at no additional cost to the Government.
Admixtures: All admixtures shall be tested and those that have been in storage at the project
Site for longer than 6 months shall not be used until proved by retest to be satisfactory.
a. Air-Entraining Admixtures: Tested for conformance to the referenced
specification under which it is furnished. The testing shall be conducted with cement and aggregate proposed for the project.
b. Other admixtures if approved, tested for conformance to the referenced
specifications under which it is furnished. The testing shall be conducted with cement and aggregate proposed for the Project.
405.7 STORAGE Storage accommodation for concrete materials shall be subject to approval and shall afford easy access for inspection and identification of each shipment in accordance with test reports.
Cement: Immediate upon receipt at the Site, the Cement shall be stored separately in a dry weather tight, properly ventilated structure, with of adequate provisions for prevention or absorption of moisture. Cement bags should not be stacked more than 13 bags high. The cement most likely to have been exposed to moisture or stored in bags for more than 3 months shall not be used unless proven by test to be in good condition.
Aggregate: Stored to assure good drainage, to preclude inclusion of foreign matter, and to
preserve the gradation. 405.8 FORMWORK Forms: Designed, constructed, and maintained so as to insure that, after removal, the
finished concrete members will have true surfaces, free of offset, waving or bulges, and will conform accurately to the indicated shapes, dimensions, .lines,
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elevation, and positions in the plan. Form surfaces that will be contact with concrete shall be thoroughly cleaned before each use.
405.8.1 DESIGN Studs and wale shall be spaced to prevent deflection of form materials. Forms and joints shall be sufficiently tight to prevent leakage of grout and cement paste during placing of concrete. Juncture of formwork panels shall occur at vertical control joints, and construction joints. Forms placed on successive units for continuous surfaces shall be fitted in accurate alignment to assure smooth completed surface free from irregularities and signs of discontinuity. Temporary opening shall be arranged to wall and where otherwise required to facilitate cleaning and inspection. Forms shall be readily removable without impact, shock, or damage to the concrete. 405.8.2 CONCRETE SURFACES TO BE EXPOSED Form surfaces that will be in contact with concrete shall be of materials that is non-reactive with concrete and that will produce concrete surfaces equivalent in smoothness and appearance to that produced by new 1.2 x 2.4 meters plywood panels approved by the Engineer. Smaller size panels shall be used only where required by opening on the above architectural lines or joints, with each area less than 1.2 meters wide formed with single panel accurately cut to the required dimensions. Cut surfaces shall be smooth and treated with form coating. Panel joints that will being contact with concrete shall be smooth and free of offset. Form materials with defects that will impair the texture and appearance of finish surfaces shall not be used. Form lining, if used, shall be installed over solid backing. Column forms shall be made with a minimum number of joints. 405.8.3 CONCRETE SURFACES TO BE UNEXPOSED Form surfaces that will be in contact with concrete shall be sound, tight lumber or other material producing equivalent finish. 405.8.4 SAMPLE CONCRETE PANELS Before constructing structural formwork, sample concrete panel for exposed or painted concrete shall be constructed and approved for smooth finish specified in paragraph FINISHES OF CONCRETE OTHER THAN FLOOR SLABS. The panel shall not be less than 1.8 meter long by 1.2 meter high. Concrete shall be of the approved design mix. Forms shall include a typical joint between form panels. Sample panels shall show tie-hole patching and smooth finish. Sample panels shall be constructed at approved locations, not as part of the structure, and shall be protected from construction operations, weather, and other damage until acceptance of the completed concrete work. The approved sample panel shall be representative of the smooth concrete finish required in the work. 405.8.5 Form Ties shall be factory-fabricated, removable or snap-off metal ties of design that it will not allow form deflection and will not spall concrete upon removal. Solid backing shall be provided for each tie. Ties shall be fitted with devices that will leave holes in the concrete surface no less than 9 mm nor more than 2.5 mm in diameter and of depth not less than 25 mm. The portions of the tie remaining in the concrete after removal of the exterior parts shall not project beyond the surface of the concrete and shall be at least 38 mm back from any surface of the concrete that will be exposed, painted, damp-proofed, water-proofed, or receive direct applications of plaster. Bolts and rods that are to be completely withdrawn shall be coated with a non-staining bond breaker. 405.8.6 CHAMFERING External corners of columns, girders, beams, foundation wall projecting beyond overlaying masonry, and other external corners that will be exposed shall be chamfered, beveled or rounded, not less than 19 mm, by molding in the forms unless the drawings specifically state that chamfering is to be omitted.
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405.8.7 COATINGS Forms for exposed surfaces shall be coated with form oil or form-release agent before reinforcement is placed. The coating shall be a commercial formulation of satisfactory and proven performance that will not bond with, stain, or adversely affect concrete surfaces, and will not impair subsequent treatment of concrete surfaces depending upon or adhesion nor impede the wetting of surfaces to be cured with water or curing compounds. The coating shall be used as recommended in the manufacturer’s printed or written instructions. Forms for unexposed surfaces may be wet with water in lieu of coating immediately before placing of concrete. Surplus coating on form surfaces and coating on reinforcement steel and construction joints shall be removed before placing concrete. 405.8.8 Removal of forms shall be in a manner to insure complete safety of the structure after the following conditions have been met. Where structural as a whole is supported on shores, forms for beam and girder sides, columns, and similar vertical structural members may be removed after 24 hours, provided concrete is sufficiently hard not to be injured thereby. Supporting forms of shoring shall not be removed until structural members have acquired sufficient strength to support safely their own weight and any construction and/or storage load to which they may be subjected, but in no case shall they be removed in less than 7 days, nor shall forms used for curing be removed before expiration of curing period except as specified in paragraph CURING. Care shall be taken to avoid spalling the concrete surface or damaging concrete edges. Wood forms shall be completely removed.
a. Control Tests: Results of suitable control tests will be used as evidence that concrete has attained sufficient strength to permit removal of supporting forms. Cylinders required for control tests shall be provided in addition to those otherwise required by the specifications. Test specimens shall be removed from molds at end of 24 hours and stored near to the structure as possible at points of sampling, shall receive insofar as practicable the same protection from the elements during curing as given in those portions of the structure which they represent, and shall not be removed form the structure for transmittal to the laboratory prior to expiration of three-fourths of the proposed period before removal of forms. Supporting forms or shoring shall not be removed until control-test specimens have attained strength of at least 15.68 Mpa. The newly unsupported portions of the structure shall not be subject to heavy construction or material loading.
b. Tie-Rods to be entirely remove from the wall shall be loosened 24 hours after concrete is
placed, and form ties, except for a sufficient number to hold forms in place, may be removed at that time. Ties wholly withdrawn from wall shall be pulled toward the face that will be concealed from view in the permanent work.
405.9 REINFORCEMENT 405.9.1 REINFORCEMENT Fabricated to shapes and dimensions shown and shall be placed where indicated. Reinforcement shall be of loose or flaky rust and mill scale, or coating, and any other substance that would reduce or destroy the bond. Reinforcing steel reduce in section shall not be used. After any substantial delay in the work, previously placed reinforcing steel for future binding shall be inspected and cleaned. Reinforcing steel shall not be bent or straightened in a manner injurious to the steel or concrete. Bars with kinks or bends not shown on the Drawing shall not be placed. The use of heat to bend or straighten reinforcing steel shall not be permitted. Bars shall be removed as necessary to avoid interference with other reinforcing steel, conduits, or embedded items. If bars are move more than one bar diameter, the resulting arrangement of bars including additional bars necessary to meet structural requirement shall be approved before concrete is places. In slabs, beams, and girders, reinforcing steel shall not be spliced at points of maximum stress unless
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otherwise indicated. Unless otherwise shown on the Drawing, laps or splices shall be 40 times the reinforcing bar diameter. 405.9.2 The nominal dimensions and unit weights of bar designation shall be in accordance with the
following table:
Nominal Diameter Nominal Perimeter (mm)
Nominal Sectional Area (sq.mm)
Unit Weight (Kg/m)
6 mm 18.8 28.27 0.222
10 mm 31.4 78.54 0.616
12 mm 37.7 113.10 0.888
16 mm 50.3 201.10 1.579
20 mm 62.8 314.2 2.466
25 mm 78.5 490.9 3.854
28 mm 88.0 615.7 4.833
32 mm 100.5 804.2 6.313
36 mm 113.1 1017.9 7.991
40 mm 125.7 1256.6 9.864
50 mm 157.1 1963.5 15.413
405.9.3 Wire-mesh reinforcement shall be continuous between crack control joints in slabs on grade and shall be continuous between expansion joints in other slabs. Laps shall be at least one full mesh plus 50 mm staggered to avoid continuous lap in either direction, and securely wired or clipped with standard clips. 405.9.4 Dowels in slabs on grade shall be installed at right angles to construction joints and expansion joints. Dowels shall be accurately aligned parallel to the finished surface, and shall be rigidly held in place and supported during placing of the concrete. One end of dowels shall be oiled or greased. 405.9.5 Tie bard on grade shall be placed at right angles to construction joints. Tie bars shall be accurately aligned parallel to the finished surface, and shall be rigidly held in place and supported during placing of the concrete. 405.9.6 Supports shall be provided in conformance with ACI 315 and ACI 318 unless otherwise indicated or specified. Wire ties, when used, shall be a 16-gauge black annealed wire and shall have end pointing away from the form.
a. For slabs on grade: Reinforcement shall be supported on pre-cast structure units spaced at intervals required by size of reinforcement used, to keep reinforcement the minimum height specified or indicated above the underside of slab or footing.
b. For slabs other than on grade: Supports for which any portion will be less than 25 mm
concrete surface that will be exposed to view or painted shall be plastic-coated steel conforming to ACI 315, stainless steel, pre-cast concrete units, or plastic. Pre-cast concrete units shall be wedge-shaped, not larger than 9 cm, and of thickness equal to that indicated for concrete protection of reinforcement. The pre-cast units shall have cast-in galvanized tie wire booked at top for anchorage and shall blend with concrete surfaces after finishing is completed.
c. Concrete shall be of the same quality as for slabs, but with coarse aggregate reduced.
Plastic supports shall be of strength and spaced so as not to be deformed weight to which it is subjected.
405.9.7 Welding of reinforcing bars shall only be permitted where shown; all welding shown shall be performed in accordance with AWS D 12.1 405.9.8 Exposed reinforcement bars, dowels and plates lm13 intended for bonding with future extensions shall be protected from corrosion.
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405.9.9 Concrete Protection for Reinforcement
a. The minimum concrete cover of reinforcement shall be as indicated on the Drawings and as shown in the table below.
b. Tolerance for Concrete Cover of Reinforcing Steel other than Tendons.
Minimum Cover Maximum Variation
7.5 cm. Or more 9 mm
less than 7.5 cm. 6 mm
405.10 PROPORTIONS OF CONCRETE MIXES 405.10.1 Trial design batches and testing to meet requirements of the classes of concrete specified shall be the responsibility of the Contractor. The design mix shall be of consistencies specified hereafter in Test for Slump, unit weight, and air content shall be performed in the field under the presence of the Engineer. 405.10.2 Entrained-Air Content: Air-entrainment shall be produced by adding an air-entraining agent at the mixer. Air Content in concrete by volume shall be maintained at 5 to 7 percent, as determined by ASTM C 231. 405.10.3 Concrete Proportioning: Samples of approved aggregate shall be obtained in accordance with the requirements of ASTM D 75. Samples of materials other than aggregate shall be representative of those proposed for the project and shall be accompanied by the manufacturer’s test reports indicating compliance with applicable specified requirements. Trial mixes having proportions, consistencies and air content suitable for the work shall be made based on ACI Standard 211.1 using at least three different water-cement ratios which will produce a range of strength encompassing those required for the work. Trial mix shall be designed for maximum permitted slump and air content. The temperature of concrete in each trial batch shall be reported. For each water-cement ratio at least three test cylinders for each test age shall be made and cured in accordance with ASTM C 39. From these test results, a curve shall be plotted showing the relationship water-cement ratio and strength. 405.10.4 Average Strength: For each portion of the structure, proportions shall be selected so that the maximum permitted water-cement ration is no exceeded and so as to produce an average strength to exceed the specified strength fc’ by the amount indicated below. Where production facility has a standard deviation record determined in accordance with ACI 214, based on 30 consecutive strength tests of similar mixture proportions as proposed it shall be used in selecting average strength. The average strength used as the basis for selecting proportions shall exceed the specified strength fc’ by at least:
1. 30 kg/sq. cm. If standard deviation is less than 20 kg/sq. cm. 2. 40 kg/sq. cm. If standard deviation is 20 to 30 kg/sq. cm. 3. 50 kg/sq. cm. If standard deviation is 30 to 40 kg/sq. cm. 4. 60 kg/sq. cm. If standard deviation is 40 to 50 kg/sq. cm. 5. If the standard deviation exceed 50 kg. Sq. cm. Or if a standard deviation record is not
available, proportions shall be selected to produce an average strength of at least 70 kg/sq. cm. Greater than the specified strength.
405.10.5 Corrective additions to remedy deficiencies in aggregate gradation shall be used only on written approval of the Engineer.
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405.10.6 Slump: Tests shall be made in conformance with ASTM C 143, and unless otherwise specified by the Engineer slump shall be within the following limits:
Structural Element Slump for Vibrated Concrete
Minimum Maximum
Pre-cast Concrete 5 cm 7 cm
Wall, column and grade beam, 25cm maximum thickness
5 cm 7 cm
All other concrete 5 cm 10 cm
Lean Concrete 10 cm 20 cm
405.11 BATCHING AND MIXING 405.11.1 The Contractor shall provide a semi-automatic or better batching plant and concrete
mixing equipment having a sufficient capacity to satisfy concrete placement requirements. 405.11.2 B ATCHING PLANT 1. Arrangement: Separate bins or compartment shall be provided for each size or classification of
aggregate and for bulk Portland cement. The compartments shall be of ample size and so constructed that the materials will be maintained separately so that the flow of each material into its batcher is stopped automatically when the designated weight has been reached.
2. Aggregates may be weighed in separate weigh batches with individual scales, or cumulatively on
one weigh batcher with one scale. Bulk cement shall be weighed on a separate scale in a separate weigh batcher. Water may be measured by weight or by volume. If measured by weight, it shall not be weighed cumulatively with another ingredient. Batching controls shall be so interlocked that the charging mechanism cannot be opened until the scales have returned to zero. These requirements can be satisfied when actuated by one or more starting mechanism.
A semi-automatic batcher control shall start the weighing operation of each material and stop automatically when the designated weight of each material has been reached and interlocked in such a manner that the discharge device cannot be actuated until the indicated material is within the applicable to tolerance. The plant shall be arranged so as to facilitate the inspection of all operations at all times. Suitable facilities shall be provided for obtaining representative samples of aggregate from each of the bin of compartments for test purposes. Delivery of materials from the batching equipment shall be within the following limits of accuracy.
Materials Percent
Cement 1
Water 1
Aggregate 2
Admixtures 3
3. Water Bather and dispenser for Admixtures: Equipment for batching water and admixtures shall
be provided at the batching plant or included with the paving mixer or truck mixers as required for the type of plant used.
a. Water Batchers: A suitable water measuring device shall be provided which will be capable
of measuring the mixing water within the specified requirements for each batch. The mechanism for delivering water to the mixers shall be such that leakage will not occur when the values are closed.
The filling and discharge valves for the water batcher shall be so interlocked that the discharge valve cannot be opened before the filling valve is fully closed.
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b. Dispensers: An accurate mechanical device for measuring and dispensing each admixture
shall be provided. Each device shall be capable of ready adjustment to permit varying of the quantity of admixture to be batched. Each dispenser shall be interlocked with the batching and discharging operations of the water so that each admixture is separately batched and discharge automatically in a manner to obtain uniform distribution throughout the batch in the specified mixing period. When use of truck mixers makes this requirement impracticable, the admixture dispenser shall be interlocked with the sand batcher. Admixtures will not be combined prior to introduction into water or sand.
3. Moisture Control: The plant shall be capable ready adjustment to compensate for the varying
moisture contents of the aggregate, and to change the weights of the materials being batched. An electric moisture meter shall be provided for measurement of moisture content in the fine aggregate. The sensing element shall be arranged so that the measurement is made near the batcher charging gate of the sand bin or in the sand batcher.
4. Scales: Adequate facilities shall be provided for the accurate measurement and control of each
of the material entering each batch of concrete. The weighing equipment shall conform to the applicable requirements of National Bureau of Standard Handbook 44 or other international standard for scale except that the accuracy shall be within 0.2 percent of scale capacity. The Contractor shall provide standard test weights and any other auxiliary equipment required for checking the operating performance of each scale or other measuring device. Each weighing unit shall include visible springless dial which shall indicate the scale load at all stages of the weighing operation, or shall include a beam scale with a beam balance indicator which will show the scale in balance at zero load and at any beam setting. The indicator shall have an over and under travel equal to at least 5 percent of the capacity of the beam. The weighing equipment shall be arranged so that the plant operator can conveniently observed all dials or indicators.
6. Recorders:
a. An accurate recorder or recorders shall produce a graphical or digital record of the scale reading after each of the aggregates and cementing materials have been batched prior to delivery to the mixer and after the batchers have been discharged ( return to zero reference ). The weights or volume of water and admixtures shall also be recorded if batched at a central batching plant.
b. The recorder shall be housed in a cabinet which shall be capable of being locked. c. The charts or tapes shall clearly indicate the different types of mixes used by stamped letters,
numerals, colored ink or by other suitable means.
d. The charts or tapes shall be so marked that variations in batch weights of each type of mix can be readily observed.
e. The charts of tapes shall show time of day ( stamped or pre-printed ) at intervals of not more
than 15 minutes f. The recorded charts or tapes shall become the property of the PMO. g. The recorders shall be placed in a position. Convenient for observation by the plant operator
and the PMO. h. All weighing, indicating, recording and control equipment shall be sufficiently protected
against exposures to dust, moisture and vibration so that there is no interference with proper operation of the equipment.
i. The recorded weights or volumes when compared to the weights or volumes actually batched
shall be within the following limits of accuracy.
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Materials Percent
Cement 2
Water 2
Aggregate 4
Admixtures 6
405.11.3 CONCRETE MIXERS Stationary mixers, truck mixers, or paving mixers of approved design. The mixers shall have a rated capacity of at least 0.76 cu. m. of mixed concrete, and shall not be charged in excess of the capacity recommended by the manufacturer. Mixers shall be capable of combining the material into a uniform mixture and of discharging this mixture without segregation. Stationary and paving mixers if used shall be provided with an acceptable device to lock the discharge mechanism until the required mixing time has elapsed. The mixing plant shall include device for automatically counting the total number of batches of concrete mixed. The mixers shall be operated at the drum or mixing blade speed designated by the manufacturer on the name plate. The mixing period specified herein are predicated on proper control of the speed of rotation of the mixer drum or blades, and on proper introduction of the materials into the mixer. The acceptability of truck mixers will be determined by uniformity tests as required by ASTM C 94, the mixing time for stationary or paving mixers will be increased when such increase is necessary to secure the required uniformity and consistency of the concrete. Excessive over-mixing requiring additions of water will not be permitted. The mixers and mixer drums shall be maintained unsatisfactory operating condition and mixer shall be kept free of hardened concrete. Mixer blades shall be replaced when worn more than 10 percent of their dept. Should any mixer at any time produce unsatisfactory results, its use shall be promptly discontinued until it is repaired. 1. Stationary Mixers: The mixing time for each batch after all solid materials are in the mixer,
provided that all of the mixing water is introduced before one-fourth of the mixing time has elapsed, shall be one minute for mixers having a capacity of 0.76 cu. m. and for mixers of larger capacities the mixing time shall be increased by 15 second for each additional 0.76 cu. m. or fraction thereof concrete mixed. When stationary mixer is used for partial mixing of the concrete (shrink mixed) the mixing time in the stationary mixer may be reduced to the minimum necessary to item the ingredients (about 30 seconds).
2. Truck Mixers: Conform to the requirements of ASTM C94 including requirements or uniformity of
concrete. When a truck mixer is used either for complete mixing (transit mixed) or to finish the partial mixing done in a stationary mixer, in absence of uniformity test data, each batch of concrete shall be mixed not less than 70 nor more than 100 revolutions of the drum at the rate of rotation designated by the manufacturer of the equipment as mixing speed and at the capacity designated in ASTM C94. If the batch is at least 0.38 cu. m. less than the rated capacity, in the absence of uniformity test data, the number of revolutions at mixing speed may be reduced to not less than 50. Any additional mixing shall be done at the speed designated by the manufacturer of the equipment at agitating speed. Each truck shall be equipped with two counters from which it shall be possible to determine the number of revolutions at mixing speed and the number of revolutions at agitating speed.
3. Vehicles used in transporting materials from the batching plant to the mixers shall have bodies or
compartments of adequate capacity to carry the materials and to deliver each batch, separate and intact to the mixer. Bulk cement shall be transported from the batching plant to the mixers in separate closed boxes or compartments, or shall be transported, mixed with the aggregates or placed between layers of aggregates in batch trucks having windproof and rain-proof covers as weather conditions require. Concrete containing batched cement and aggregates shall be placed within the time specified in paragraph: Time interval between mixing and placing under paragraph PLACING CONCRETE. Serially numbered tickets shall be provided for each delivery of batched cement and aggregates and before discharging any batch in mixer. Tickets shall be stamped by time clock to show date and time the loading of each truck was completed. One ticket shall be given to the Engineer before discharging any batch into the mixer.
3. Paving Mixers used at the site of the work: For paving use, paving mixers shall be equipped with
boom and bottom-drum bucket to handle the concrete from the mixer to the form. The bucket
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shall be of adequate size to handle the complete batch of concrete mixed, and the boom shall be of sufficient length to permit discharge of the concrete into its final position in the form. Paving mixers may be either single compartment drum or multiple compartment drum type.
A sled or box of suitable size shall be attached to the mixer under the bucket so as to catch any spillage of concrete that may occur when the mixer if discharging into the bucket. For use other than paving, the boom is not required; the mixer may discharge directly into the bucket to be used for final placement. Multiple compartment drum paving mixers shall be properly synchronized, and the mixing time shall be determined by including the time required to transfer the concrete between compartments of the drum. If no uniformity test data are available, the mixing time for each; batch, after all solid materials are in the mixer drum, provided that all the mixing water is introduced before one-fourth of the mixing time has elapsed, shall be 1 minute for mixers having a capacity of 0.76 cu. m. and for mixers of larger capacities, the minimum mixing times shall be increased 15 seconds for each additional 0.76 cu. m. or fraction thereof of concrete mixed.
5. Sampling: Provide suitable facilities and labor for obtaining representative samples of concrete for
the Contractor’s quality control and the Employer’s quality assurance testing. The Contractor shall furnish all necessary platform, tools, and equipment for obtaining samples.
405.12 JOINTS 405.12.1 No reinforcement, corner protection angles or other fixed metal items shall be run
continuous through joints containing expansion-joint filler, through crack-control joints in slabs on grade and vertical surfaces.
405.12.2 Pre-molded Expansion Joint Filler 1. Joints with Joint Sealant: At expansion joints in concrete slabs to be exposed, and at the other
joints indicated to receive joint sealant, pre-molded expansion-joint filler strips shall be installed at the proper level below the elevation with a slightly tapered, dressed-and-oiled wood strip temporarily secured to the top thereof to form a groove, when surface dry, shall be cleaned of foreign matter, loose particles, and concrete protrusions, then filled approximately flush with joint sealant so as to be slightly concave after dying.
2. Finish of concrete at joints: Edges of exposed concrete slabs along expansion joints shall be nearly finished with a slightly rounded edging tool.
405.12.3 Construction Joints: Unless otherwise specified herein, all construction joints shall be subjected to approval of the Engineer. Concrete shall be placed continuously so that the unit will be monolithic in construction. Fresh concrete may be placed against adjoining units, provided the set concrete is sufficiently hard not to be injured thereby. Joints not indicated shall be made and located in a manner not to impair strength and appearance of the structure. Placement of concrete shall be at such rate that surfaces of concrete no carried to joint levels will not have attained initial set before additional concrete is placed thereon. Lifts shall terminate at such levels as are indicated or as to conform structural requirements as directed. If horizontal construction joints are required, a strip of 25 mm square-edge lumber, beveled to facilitate removal shall be tacked to the inside of the forms at the construction joint. Concrete shall be placed to a point 25 mm above the underside of the strip. The strip shall be removed 1 hour after the concrete has been placed, any irregularities in the joint line shall be leveled off with a wood float, and all laitance removed. Prior to placing and additional concrete, horizontal construction joints shall be prepared as specified in “BONDING”. 405.12.4 Crack-control joints in slabs on grade are specified in paragraph. SLAB ON GRADE. 405.12.5 Water stops shall be installed so as to form a continuous water-tight diaphragm. Adequate provision shall be made to support and completely protect the water stops during the progress of the work. Joints and splices shall made as follows:
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Copper shall be soldered or blazed. When stainless steel is used, splicers, shall be lapped and welded, and brazing shall be in conformance with the manufacturer’s recommendations. 405.13 INSTALLATION OF ANCHORAGE ITEMS 405.13.1 Slots: Adequate inserts shall be provided for anchoring members at openings. Slots and dowels shall be provided for anchoring ends and tops of masonry partitions abutting concrete. 405.13.2 Inserts for hangers for piping and mechanical fixtures and their installation shall be as specified under “PLUMBING”. 405.14 PREPARATION FOR PLACING Hardened concrete, debris and foreign materials shall be removed from interior of forms and from inner surface of mixing and conveying equipment. Reinforcement shall be secured in position, and shall be inspected, and approved before placing concrete. Runways shall be provided for wheeled concrete-handling equipment; such equipment shall not be supported on reinforcement. 405.15 PLACING CONCRETE 405.15.1 Concrete shall be handled from mixer to transport to place of final deposit in a continuous manner, as rapidly as practicable and without segregation of loss of ingredient until the approved unit of work is completed. Placing will not be permitted when the sun, heat wind or limitations of facilities furnished by the Contractor prevent proper finishing and curing of the concrete. Concrete shall be placed in the forms, as close as possible in final position, in uniform approximately horizontal layers not over 400 mm deep. Forms splashed with concrete and reinforcement splashed with concrete of form coating shall be cleaned in advance of placing of subsequent lifts. Concrete shall not be allowed to drop freely more than 1.5 m. in unexposed work nor shall more than 1.0 m in exposed work; where greater drops are required, tremie or other approved means be employed. The discharge of the tremies shall be controlled so that the concrete may be effectively compacted into horizontal layers no more than 400 mm thick, and the spacing of the tremies shall be such that segregation does not occur. Concrete to receive other construction shall be screeded to the proper level to avoid excessive shimming or grouting. Conduits and pipes shall not be embedded in concrete unless specifically indicated. 405.15.2 Time Interval between Mixing and Placing: Concrete mix in stationary mixers and transported by non-agitating equipment shall be placed in the forms within 45 minutes from the tie ingredients are charged into the mixing drum. Concrete transported in truck mixers or truck agitators shall be delivered to the site of work discharge in the forms within 45 minutes from the time that ingredients are discharge into the mixing drum. Concrete shall be placed in the forms within 15 minutes after discharge from the mixer at the job site. 405.15.3 Hot Weather Requirements: Temperature of concrete during the period of mixing transport and or placing shall not be permitted to rise above 16 degree Celsius. Any batch of concrete which had reached a temperature greater than 35 degree Celsius any time in the aforesaid period shall not be placed but shall be rejected, and shall not thereafter be used in any part of the permanent works.
1. Control Procedures: Provide water cooler facilities and procedures to control or reduce the temperature of cement, aggregates and mixing handling equipment to such temperature that, at all times during mixing, transporting, handling and placing, the temperature of the concrete shall not be greater than 36 degree Celsius. 2. Cold Joints and Shrinkage: Where cold joints tend to form or where surfaces and dry too rapidly or plastic shrinkage cracks ten to appear, concrete shall be kept moist by fog sprays and other approved means, applied shortly after placement, and before finishing.
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3. Supplementary Precautions: When the aforementioned precautions are not sufficient to satisfy the requirements herein above, they shall be supplemented by restricting work to evening or night. Procedure shall conform to American Concrete Institute Standard ACI 305.
405.15.4 Earth-foundation placement: Concrete footings, exterior slabs and exterior foundations receiving equipment to machinery shall be placed upon undisturbed surfaces conforming to Section EXCAVATION FILLING, AND BACKFILLING. The surfaces shall be clean free from mud and water. Waterproof paper, polyethylene sheeting of nominal 0.4mm minimum thickness shall be laid over dry or impervious surfaces receiving concrete. Such material is of a type specified for curing concrete except that the polyethylene sheet may be other than white. The concrete footings and exterior slabs and foundation may be placed directly over impervious surfaces that are thoroughly moistened by not muddy at the time concrete is placed. 405.15.5 Conveying Concrete by Chute, Conveyor or Pump: chute, conveyor, or pump may convey Concrete if approved in writing. In requesting approval, the Contractor shall submit his entire plan of operation from time of discharge of concrete from the mixer to final placement in the forms, and the steps to be taken to prevent the formation of cold joints, in case the transporting of concrete by chute, conveyors and pump shall be capable of expeditiously placing concrete at the rate most advantageous to good workmanship. Approval will not be given for chutes of conveyors requiring changes in the concrete materials or design mix for efficient operation.
1. Chutes and Conveyors: Chutes shall be of steel or steel lined wood, round in cross section rigid in construction, and protected from overflow. Conveyors shall be designed and operated and chute sections shall be set to assure a uniform flow of concrete from mixer to final place of deposit without segregation or ingredients, loss of mortar, or change of slump. The discharge portions of each chute or convey shall be provide with a device to prevent segregation. The chute and conveyor shall be thoroughly cleaned before and after each run. Waste material and flushing water shall be discharged outside the forms.
2. When using tilted chutes, the inclination should not be flatter than (1) vertical and two (2)
horizontal. From the outlet/mouth of the chute to the concrete surface the maximum allowable height shall be 1.50m.
3. Pumps shall be operated and maintained so that a continuous stream of concrete is delivered
into the forms without air pocket, segregation or change in slump. When pumping is completed concrete remaining in the pipeline shall be ejected, and wasted without contamination of concrete already placed. After each operation, equipment shall be thoroughly cleaned and the flushing water shall be splashed outside the forms.
405.5.16 Placing concrete through reinforcement: Where congestion of the steel or other conditions will make placing or compactions of concrete difficult, a layer of mortar shall be first deposited in forms to a depth of approximately 25 cm. Mortar proportions shall be the same as the concrete minus the coarse aggregate. 405.16 COMPACTION 405.16.1 Immediately after placing, each layer of concrete vibrator supplemented by hand spading, rodding, and tamping. Tappings or other external vibration of forms will not be permitted unless specifically approved by the Engineer. Vibrators shall not be used to transport concrete inside forms. Internal vibrators submerged in concrete shall maintain speed of not less than 7,000 impulses per minute. The vibrating equipment shall be at all times being adequate in number of units and power to properly consolidate all concrete. 405.16.2 Spare units shall be on hand as necessary to ensure such adequacy. Duration of vibrating equipment shall be limited to time necessary to produce satisfactory consolidation without causing objectionable segregation. The vibrator shall not be inserted into lower coursed that have begun to set.
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Vibrators shall be applied at uniformly spaced points not further apart than the visible effectiveness of the machine. 405.17 BONDING Before depositing new concrete on or against concrete that has set, the surfaces of the set concrete shall be thoroughly cleaned so as to expose the coarse aggregate and be free of laitance, coatings, foreign matter and loose particles. Forms shall be re-tightened. The cleaned surfaces shall be moistened, but shall be without free water when concrete is placed. 405.18 SLABS ON GRADE 405. Capillary water barrier or sub-grade shall conform. Section EXCAVATION AND BACKFILLING FOR BUILDINGS. 405.18.2 Vapor Barrier: Immediately prior to placing concrete, the capillary water barrier or sub-grade under slabs within the building shall be covered with a vapor barrier. Punctures and tears shall be patched. Edges shall be lapped not less than 100 mm and end joints shall be lapped not less than 150 mm. Edges and lapped joints shall be sealed with a pressure sensitive tape, not less than 50 mm wide, compatible with the membrane. 405.18.3 Concrete shall be compacted, screeded to grade, and prepared for the specified finish. Concrete shall be placed continuously so that each unit of operation will be monolithic in construction. Concrete shall be placed in alternate check-board pattern termination at crack-control joints and with construction joints or may be placed in alternative paving lanes as limited by expansion and contraction joints and with construction joints or provide panels of size specified. Crack-control joints shall be expansion, contraction, or construction joints. Joints not shown shall be located at column centerlines and at intermediate intervals so that such panel shall not be more than 55 square meter in area. Panels shall be approximately square with dimension of one side not more than 7.5 meter. Forms shall remain in place for at least 12 hours after concrete placement. 405.18.4 Construction joints may be formed by the insertion of hard-pressed fiberboard strips inserted in the plastic concrete or may be cut with an approved concrete-sawing matching after the concrete has set. Unless otherwise indicated or directed, the joints shall be 3 mm wide and depth equal to approximately `1/4 of the slab thickness or of the maximum size of the coarse aggregated whichever is greater. a. Fiberboard joints: Fiberboard strips shall be of the required dimensions and as long as
practicable. After the first floating, the concrete shall be grooved with a total at the desired joint locations to a depth approximately equal to the width of the strip. The strip shall be inserted in the groove, using a U-shape device of sheet metal fitted over the top of the strip to maintain true alignment until the top edge of the strip is flush with the surface of the slab.
b. When the concrete has set sufficiently to retain the strip, the sheet metal device shall be
withdrawn. The slab shall be floated and finished as specified, using an edging tool on each side of the inserted joint strip where slabs will be left exposed to view.
405.18.5 Sealing: Concrete joints, where sawed or formed, 13 m. shall be filled with joint sealant except where floor covering is required. 405.19 SETTING OF BASE PLATES 405.19.1 Preparation: After being plumbed and properly positioned, base plates shall be provided with full bearing with damp-pack bedding mortar, except where expansive grout is indicated. The space between the top of concrete or masonry bearing surfaces and the bottom of the plate shall be approximately 1/24 of the width of the plate, but not less than 13 mm for plates less than 30 cm
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wide. Concrete surfaces shall be rough clean free of oil, grease, and laitance, and shall be damp. Metal surfaces shall be clean and free of oil, grease and rust. 405.19.2 Mortar: Damp-pack bedding mortar shall consist of one part Portland cement and 2.5 parts of fine aggregates, suitable to the work required, proportioned by weight and not more than 17 liters of water per bag of cement. The space between the top of the plate shall be packed with the bedding mortar by tamping or ramming with a bar or rod until the voids are completely filled. 405.19.3 Expansive Grout: Grout shall derive its expansive proper ties from the liberation of gas into the mixture during and after mixing. Thi9s includes typically, and chemical reaction of metallic aluminum with alkali hydroxides in solution which causes the evolution of hydrogen gas. Expansion of such materials may be expected to continue after the gas liberating mechanism has been exhausted or until the mixture has solidified to such an extent that the tendency for the evolving gas to expand is effectively registered by the stiffness of the grout.
a. When tested as provided for herein, and expansive grout shall meet the following performance requirements:
Expansion, 28 days, % max…………..0.40 min…………. 0.03
b. It will be the Contractor’s responsibility to supply the necessary manufacturer’s certificates. 405.20 FINISHES OF CONCRETE 405.20.1 Within 12 hours after forms are removed, surface defects shall be remedied as specified herein. Temperature of the concrete, ambient air and mortar during remedial work including curing shall be above 10 deg, Celsius. Fine and loose material shall be removed. Honeycomb, aggregate pockets, voids over 13 mm in diameter, and holes left by the rods or bolts shall be cut out to solid concrete, reamed, thoroughly wetted brush-coated with neat cement grout, and filled with mortar. Mortar shall be a stiff mix of 1 part Portland cement to not more than 2 parts fine aggregate passing the No. 16 mesh sieve, and minimum amount of water. The color of the mortar shall be match the adjoining concrete color. Mortar shall be thoroughly compacted in place. Holes passing entirely through walls shall be completely filled from the inside face by forcing mortar through to the outside face. Holes which do not pass entirely through wall shall be packed full. Patchwork shall be finished flush and in the same plane adjacent surfaces. Exposed patchwork shall be finish to match adjoining surfaces in texture and color. Patchwork shall be damp cured for 72 hours. Ambient temperature shall be not less than 10 deg. Celsius. Dusting of finish surfaces with dry material or adding water to concrete surfaces will not be permitted. 405.21 CONCRETE FINISHES FOR SLABS 405.21.1 Slabs Receiving Concrete Paving: After concrete is placed and consolidated slab shall be screeded or struck off. No further finish is required. 405.21.2 Smooth Finish: Required only where specified; screed concrete and float to required level with no coarse aggregate visible. After surface moisture has disappeared and laitance has been remove, the surface shall be finished by float and steel trowel. 405.21.3 Broom Finish: Required for paving, stairs and landing; the concrete shall be screeded and floated to required finish level with no coarse aggregate visible. After the surface shall be float finished to an even, smooth finish. The floated surfaces shall be broomed with a fiber bristle brush in a direction transverse to the direction of the main traffic. 405.21.4 Tolerance: Smooth and broom finished surfaces shall be true to plane with no deviation in excess of 3 mm in any direction when tested with a 3 m straight edge.
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405.22 FINISHES OF CONCRETE OTHER THAN FLOOR SLABS 405.22.1 Within 12 hours after forms are removed, surface defects shall be remedied as specified herein. Honeycomb, aggregate, pockets, voids over 12 mm in diameter, and holes left by the rods or bolts shall be cut out to solid concrete, reamed, thoroughly wetted, brush-coated with neat cement grout, and filled with mortar. Mortar shall be a stiff mix of 1 part Portland cement to not more than 2 parts fine aggregate passing the No. 16 mesh sieve, and minimum amount of water using white Portland cement for all or part of the cement so that when dry, the color of the mortar shall match the adjoining concrete color. Mortar shall be thoroughly compacted in place. Holes passing entirely through walls shall be completely filled from the inside face by forcing mortar through to the outside face. Holes that do not pass entirely through the wall shall be packed full. Patch-work shall be damp-cured for 72 hours. Protruding portions of bar supports shall be ground flush with concrete surfaces that will be exposed, painted, or plastered directly. 405.22.2 Smooth Finish: After the above operations have been completed, smooth finish shall be given to interior and exterior concrete surfaces that are to be painted or exposed to view. Smooth finish shall consist of thoroughly wetting and then brush-coating the surfaces with cement grout composed by volume of 1 part Portland cement to not more than 2 parts fine aggregate passing the No. 30 mesh sieve and mixed with water to the consistency of thick paint. White Portland cement shall be used for all or part of the cement, proportioned by the trial mixes, so that the final color of grout when dry, will be approximately the same as the color of the surrounding concrete. Grout shall be cork or wood-floated to fill all pits and air bubbles; and surfaces rubbed with burlap to remove any visible grout film. The grout shall be kept damp by means of fog spray during the setting period. The finish of any area shall be completed in the same day and the limits of a finished area shall be made at natural breaks in the finished surfaces. 405.22.3 Rough Slab Finish: Slab to receive fill and setting beds shall be screeded with straight-edges to bring the surface to the required finish plane with no aggregates visible. 405.22.4 Broom finish shall be given to a exterior surfaces except concrete stair treads, entrances, and landings for buildings. The concrete shall be screeded and floated to the required finish level with no coarse aggregate visible. After the surface moisture has disappeared and laitance has been remove, surfaces shall be steel-troweled to an even, smooth finish. The troweled surfaces shall be broomed with a fiber-bristle brush in a direction transverse to that of the main traffic. 405.23 CURING 405.23.1 Concrete shall be protected against moisture rapid temperature change, mechanical injury from rain of flowing water, for a minimum period of time given below: Type I Cement 7 days 405.22.2 Concrete shall be maintained in a moist condition at temperature above 10 degree Celsius throughout the specified curing period and until remedial work is started under paragraph FINISHES OF CONCRETE. Curing activities shall be started as soon as free water has disappeared from the surface of the concrete after placing and finishing. Formed under surface shall moist cure with forms in place for the full curing period, by other approve means. Curing shall be accomplished by any of the following methods or combination thereof, as approved. 405.23.3 Moist Curing: Unformed surfaces shall be covered with burlap or mats, wetted before placing and overlapped at least 150 mm. Burlap or mats shall be kept continually wet and in intimate contact with the surface. Where formed shall be kept continually wet. If the forms are removed before the end of the curing period, curing shall be continued on unformed surfaces, using suitable materials. 405.23.4 Impervious sheet Curing: All surfaces shall be thoroughly wetted with a fine spray of water and be completely covered with waterproof paper, polyethylene sheeting or with polyethylene coated burlap having the burlap thoroughly water saturated before placing. Covering shall be laid with
129
light-colored side up. Covering shall be lapped not less than 300 mm and securely weighted down or shall be lapped not less than 100 mm and taped to form a continuous cover with completely closed joints. Sheets shall be weighted to prevent displacement or billowing from winds. Covering shall be folded down over exposed edges of slabs and secured by approved means. Sheets shall be immediately repaired or replaced if tears or holes appear during the curing period. 405.23.5 Membrane-forming Curing Compound: Before applying curing compound, tops of joints that are to receive sealant shall be tightly closed with temporary material to prevent entry of the compound and to prevent moisture loss during the curing period. The compound shall be applied on damp surfaces as soon as the moisture film has disappeared. The curing compound shall be applied by power spraying using a spray nozzle equipped with a wind guard. The compound shall be applied in a two-coat, continuous operation at coverage of not more than 10 sq. m. per liter for each coat. When application is made by hand sprayers the second coat shall be applied in a direction approximately at right angles to the direction of the first coat, the compound shall form a uniform, continuous, adherent film that shall not check, crack, or peel and shall be free from pinholes or other imperfections. Surfaces subjected to rain fall within 3 hours after compound has been applied, or surface damaged by subsequent construction operations within the curing period, shall be immediately re-sprayed at the rate specified above. Membrane forming curing compound shall not be used on surface that depends on adhesion of bonding to the concrete. Membrane forming curing compound shall not be used on surfaces that are maintained at curing temperature with free steam. Where membrane-forming curing compounds are permitted, permanently exposed surfaces shall be cured by use of a non-pigmented membrane-forming curing compound containing a fugitive dye. Where non-pigmented type curing compounds are used, the concrete surface shall be shaded from the direct rays of the sun for the curing period. Surfaces coated with curing compound shall be kept free of foot and vehicular traffic, and from other courses of abrasion and contamination during the curing period. 405.24 SETTING BEDS Required over slabs for floor finished other than concrete are covered under other sections of these specifications in which the floor finish is specified. 405.25 METHOD OF MEASUREMENT The quality of structural concrete to be paid for will be the final quantity placed and accepted in the completed structure. No deduction will be made for the volume occupied by pipe less than 100 mm (4 inches) in diameter or by reinforcing steel, anchors, conduits, weep holes, or expansion joint materials. 405.26 BASIS OF PAYMENT The accepted quantities, measured as prescribed in Section 405.25, shall be paid for at the contract unit price for each of the pay items listed below, which is included in the Bill of Quantities. Payment shall constitute full compensation for furnishing, placing and finishing concrete including all labor, equipment, tools and incidentals necessary to complete the work prescribed in this item. Payment will be under:
Item No. Description Unit of Measurement
405 (1) Concrete Class A-A Cu. m.
405 (2) Concrete Class A Cu. m.
405 (3) Concrete Class B Cu. m.
405 (4) Concrete Class C Cu. m.
405 (5) Seal Concrete Cu. m.
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ITEM 701 – ROCKWORKS 701.1 SCOPE OF WORK This specification covers rockworks and the construction of the rock causeway. The works can be carried out shall be, but not limited to the following:
1. Supply and laying of the core stones bedding. 2. Supply and laying of the Armor Stones (1
st layer).
3. Supply and laying of the Armor Stones (2nd
layer). 4. Placement of concrete curb. 5. Construction of concrete pavement.
701.2 SETTING OUT WORKS
1. Topographic / Hydrographic Survey: Prior to the commencement of the work, the Contractor shall conduct a topographic/hydrographic survey in conjunction with the Engineer’s instructions. This survey shall form the basis for quantity measurement.
2. The Contractor shall set out works and be solely responsible for accuracy of such setting
out. 701.3 MATERIALS
1. Concrete for curb shall be in accordance with the provision of Item 405, Concrete Works, 2. Concrete works for pavement shall be in accordance with Item 501- Portland Cement
Concrete Pavement. 3. All rocks to be used shall be angular, hard, and durable with the long dimension not more
than three times the short. It shall be likely to disintegrate in sea water and if subjected to five (5) cycles of the sodium sulfate soundness test, the weighted loss shall not exceed 12 mass percent.
4. All rocks shall have a minimum weight of 1000 kg. per cubic meter (specific gravity 2.6) of solid materials when measured dry.
5. Rocks with specific gravity higher than the above specified is preferable and will readily be accepted. But no adjustment (increase) in the contract price will be made on this account.
6. Rocks that are sub-angular may be subject to the approval of the Engineer. Rounded or well-rounded pieces will not be accepted.
7. Rocks of the primary cover layer should be sound, durable, and hard. It should be free from laminations, weak cleavages, and undesirable weathering, and should be of such character that it will not disintegrate from the action of the air, sea water, or in handling and placing. All stone should be angular quarry stone.
8. The greatest dimensions of individual rock unit should not greater than three times the least dimension.
9. All rocks should conform to the following test designations: Apparent specific gravity, ASTM C-127 and abrasion, ASTM C-131.
10. The weight of the individual pieces of rocks may exceed the minimum in the table below
by thirty three (33%) percent but not less than the weight specified hereunder.
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1. Armor Stones
1
st layer 1 ton/pc.
2nd
layer 50 to 100 kg/pc.
2. Core Stones 1 to 30 kg/pc. Core stone bedding shall be reasonably well graded in weight between the minimum and maximum sizes. 701.4 CONSTRUCTION METHOD
1. Construction method of concrete pavement shall be in accordance with the provisions of Item 501 – Portland Cement Concrete Pavement
2. The core stone shall be placed at convenient height and width for each delivery of materials.
3. The armor stone shall cover the sides, berm and top of the causeway for core stone protection.
4. The armor stone filler shall not be less than one half (1/2) of the weight and size of the armor stone.
5. The armor stone shall be placed with the longitudinal section perpendicular to the slope and longitudinal section of the causeway.
6. No cutting, spalling or coursing of the stones shall be allowed, but it is expected that the work shall be done in a workmanlike and skilled manner, which implies careful selection of stones.
7. The armor stone shall be wedded firmly in between the facing of armor rocks so that the latter shall be in the stable position.
8. Armor stones shall be placed individually by crane equipped with suitable bucket or by other means acceptable to the Engineer.
9. The rock mole/rock causeway can be constructed by any method acceptable to the Engineer. Prior to the start of work, the Contractor shall submit to the Engineer for approval his method and sequence of construction. The Engineer’s approval of the method and sequence of construction shall not release the Contractor from responsibility to achieve the satisfactory implementation of the work.
10. Permissible Tolerance
a. Core Stones Alignment: plus or minus 0.30 m Elevation: plus or minus 0.20 m
b. Armor Stones Alignment: plus or minus 0.30 m Elevation: plus or minus 0.20 m
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Section VII. Drawings
SITE DEVELOPMENT PLANS C A L E 1 : 1000 MCW 001
1
O C E A N
P A C I F I C
BATANES
NORTE
ILOCOS
CAGAYAN
SORSOGON
CATANDUANES
APAYAO
KALINGA
IFUGAO
ABRA
ILOCOS SUR
BENGUET
MT PROVINCE
QUIRINO
VIZCAYA
NUEVA
TARLAC
NUEVA
ECIJA
LA UNION
ISABELA
POLILIO ISLANDS
NORTE
CAMARINES
RIZAL
LAGUNA
PAMPANGA
CAVITE
BATAAN
BULACAN
OCCIDENTAL
ORIENTAL
BATANGAS
QUEZON
MARINDUQUE
ALBAY
CAMARINES DEL SUR
IBA
SUBIC
BOTOLAN
S E A
P H I L I P P I N E
W E S T
Z A M B A L E S
PANGASINAN
SAMAR
EASTERN
SAMAR
NORTHERN
LEYTE
LEYTE
SOUTHERN
SAMAR
WESTERN
DEL NORTE
SURIGAO
DEL SUR
DEL NORTE
AGUSAN
AGUSAN DEL SUR
SURIGAO
BOHOL
OCCIDENTAL
MISAMIS
DEL NORTE
LANAO
CAGAYAN DE ORO
ORIENTAL
MISAMIS
BUKIDNON
C E B U
ROMBLON
ANTIQUE
GUIMARAS
CAPIZ
ILOILO
AKLAN
TABLAS
ORIENTAL
NEGROS
OCCIDENTAL
NEGROS
ZAMBOANGA
DEL NORTE
ZAMBOANGA
MASBATE
ORIENTAL
DAVAO
DEL SUR
DAVAO
COTABATO
NORTH
SULTAN
MAGUINDANAO
PROVINCE
SARANGANI
KUDARAT
COTABATO
SOUTH
BASILAN
SULU
M I N D A N A O S E A
DEL SUR LANAO DEL SUR
DAVAO
P A L A W A N
WHARF CONSTRUCTION WITH SHED
TAWI-TAWI
S E A
S U L U
MINDORO
MINDORO
BO. MELGAR, BASILISA, DINAGAT ISLAND
DINAGAT ISLAND
SIARGAO ISLAND
SOCORRO ISLAND
SITEMAYDOLONG PORT
CW-11
1
CW-1
CW-2
CW-3
CW-4
4
JMG
JCC / JIF
2014PROJECT SCOPE:
Total Sheet No.:
Sheet No.:
LOCATION :
PROJECT NAME :
CALAYAN SHELTER PORT
/
A S S H O W N
Sheet Content: Revisions:Checked by:
Approved by:
Reviewed by:
RENE K. LIMCAOCOPRC NO. VALID UNTIL
PTR NO. ISSUED ON
ISSUED AT TIN
REPUBLIC OF THE PHILIPPINES
DEPARTMENT OF TRANSPORTATION AND
COMMUNICATIONS
PROJECT DEVELOPMENT SERVICE
UNIT 83, THE COLUMBIA TOWER, BRGY. WACK WACK,
ORTIGAS AVENUE, MANDALUYONG CITY 1555
The copyright of this drawing remains the property of the Department of Transportation and Communications whose permission must be obtained before any use of it can be made.
DRAWN BY:
CHECKED BY:
DATE DRAWN:
DATE PRINTED:
DATE APPROVED:SCALE : AS SHOWNMunicipality of Calayan, Cagayan Province
-
2014Construction of Back-Up Area and Vehicular Parking Area
2014
4
LAYOUT PLANS C A L E 1 : 500 MCW 002
3
"B""A"
2
4
.2
8
R
O
A
D
CONTOUR ELEVATIONS C A L E 1 : 500 MCW 002
2
BLOCKING LAYOUTS C A L E 1 : 500 MCW 002
1
4
JMG
JCC / JIF
2014PROJECT SCOPE:
Total Sheet No.:
Sheet No.:
LOCATION :
PROJECT NAME :
CALAYAN SHELTER PORT
/
A S S H O W N
Sheet Content: Revisions:Checked by:
Approved by:
Reviewed by:
RENE K. LIMCAOCOPRC NO. VALID UNTIL
PTR NO. ISSUED ON
ISSUED AT TIN
REPUBLIC OF THE PHILIPPINES
DEPARTMENT OF TRANSPORTATION AND
COMMUNICATIONS
PROJECT DEVELOPMENT SERVICE
UNIT 83, THE COLUMBIA TOWER, BRGY. WACK WACK,
ORTIGAS AVENUE, MANDALUYONG CITY 1555
The copyright of this drawing remains the property of the Department of Transportation and Communications whose permission must be obtained before any use of it can be made.
DRAWN BY:
CHECKED BY:
DATE DRAWN:
DATE PRINTED:
DATE APPROVED:SCALE : AS SHOWNMunicipality of Calayan, Cagayan Province
-
2014Construction of Back-Up Area and Vehicular Parking Area
2014 2
CW-22 4
STATION
EL. +0.00m
EL. +1.00m
EL. +2.00m
EL. +3.00m
EL. +4.00mEL. +4.00m
EL. +5.00m
EL. -1.00m
EL. -2.00m
STATION
EL. +0.00m
EL. +1.00m
EL. +2.00m
EL. +3.00m
EL. +4.00mEL. +4.00m
EL. +5.00m
EL. -1.00m
EL. -2.00m
SECTION "B"
SECTION "A"
4
JMG
JCC / JIF
2014PROJECT SCOPE:
Total Sheet No.:
Sheet No.:
LOCATION :
PROJECT NAME :
CALAYAN SHELTER PORT
/
A S S H O W N
Sheet Content: Revisions:Checked by:
Approved by:
Reviewed by:
RENE K. LIMCAOCOPRC NO. VALID UNTIL
PTR NO. ISSUED ON
ISSUED AT TIN
REPUBLIC OF THE PHILIPPINES
DEPARTMENT OF TRANSPORTATION AND
COMMUNICATIONS
PROJECT DEVELOPMENT SERVICE
UNIT 83, THE COLUMBIA TOWER, BRGY. WACK WACK,
ORTIGAS AVENUE, MANDALUYONG CITY 1555
The copyright of this drawing remains the property of the Department of Transportation and Communications whose permission must be obtained before any use of it can be made.
DRAWN BY:
CHECKED BY:
DATE DRAWN:
DATE PRINTED:
DATE APPROVED:SCALE : AS SHOWNMunicipality of Calayan, Cagayan Province
-
2014Construction of Back-Up Area and Vehicular Parking Area
2014 3
CW-33 4
HINGED CONSTRUCTION (J-4) DUMMY CONTRACTION (J-7) DOWELED BUTT CONSTRUCTION (J-8) (WHEN NEEDED)
1 cm
T/4 T
O T
/6
T/2
TTT
0.1T
1 cm1 cm
0.2T
T/2
T/4 T
O T
/6
2cm
+
/- 3m
m
TYPICAL BLOCKING PLAN & DETAILSS C A L E 1 : 100 MTS
TYPE "A" EXPANSION (J-1A) (IF ANY)
2cm
7.5
cm
T/2
T
2 cm
2cm
+
3m
m
@ every 60 M. ( minimum )
500
50
0
FOOTING DETAIL 1S C A L E 1 : 20 MTS
3000 3000 3000
70
00
35
00
35
00
600500
600
FOOTING DETAIL 2S C A L E 1 : 20 MTS
1500
900 600
250
384
634
BLOW-UP SECTIONS C A L E 1 : 40 MCW 004
1
@ SECTION A
4
JMG
JCC / JIF
2014PROJECT SCOPE:
Total Sheet No.:
Sheet No.:
LOCATION :
PROJECT NAME :
CALAYAN SHELTER PORT
/
A S S H O W N
Sheet Content: Revisions:Checked by:
Approved by:
Reviewed by:
RENE K. LIMCAOCOPRC NO. VALID UNTIL
PTR NO. ISSUED ON
ISSUED AT TIN
REPUBLIC OF THE PHILIPPINES
DEPARTMENT OF TRANSPORTATION AND
COMMUNICATIONS
PROJECT DEVELOPMENT SERVICE
UNIT 83, THE COLUMBIA TOWER, BRGY. WACK WACK,
ORTIGAS AVENUE, MANDALUYONG CITY 1555
The copyright of this drawing remains the property of the Department of Transportation and Communications whose permission must be obtained before any use of it can be made.
DRAWN BY:
CHECKED BY:
DATE DRAWN:
DATE PRINTED:
DATE APPROVED:SCALE : AS SHOWNMunicipality of Calayan, Cagayan Province
-
2014Construction of Back-Up Area and Vehicular Parking Area
2014 4
CW-44 4
137
Section VIII. Bill of Quantities
138
BID ANNEX 5
PROJECT TITLE : Construction of Calayan SeaportLOCATION : Construction of Back-Up Area
Excavation
Aggregate Base Course
Portland Cement Concrete Pavement (0.2m thk)
Concrete Works
Class III Core Rocks (20-50kg/pc)
Class II Core Rocks (100-200kg/pc)
TEMPORARY FACILITIES
AMOUNT IN WORDS :
Submitted By :
Signing Authority :
Designation :Date :
1.00 l.s.SPL-1
cu.m.508.b 766.59
405
311 sq.m. 1,823.90
cu.m. 3,287.19
cu.m. 66.00
508.a
AMOUNT NO. COST
201
102
cu.m. 526.00
cu.m. 852.00
PROPOSAL SCHEDULE
(14.1) (14.2) (14.3) (14.4) (14.5) (14.6)ITEM ITEM OF WORK UNIT QUANTITY UNIT BID
(Printed Name and Signature)
*** nothing follows ***
TOTAL PROJECT COST
(Name of Firm)
139
Section IX. Bidding Forms
TABLE OF CONTENTS
Bid Form .............................................................................................................................................. 141
Form of Contract Agreement .............................................................................................................. 143
Omnibus Sworn Statement ................................................................................................................. 145
(a) We have examined and have no reservation to the Bidding Documents, including Addenda, for the Contract [insert name of contract];
(b) We offer to execute the Works for this Contract in accordance with the Bid and Bid Data Sheet, General and Special Conditions of Contract accompanying this Bid;
The total price of our Bid, excluding any discounts offered in item (d) below is: [insert information];
The discounts offered and the methodology for their application are: [insert information];
(c) Our Bid shall be valid for a period of [insert number] days from the date fixed for the Bid submission deadline in accordance with the Bidding Documents, and it shall remain binding upon us and may be accepted at any time before the expiration of that period;
(d) If our Bid is accepted, we commit to obtain a Performance Security in the amount of [insert percentage amount] percent of the Contract Price for the due performance of the Contract;
(e) Our firm, including any subcontractors or suppliers for any part of the Contract, have nationalities from the following eligible countries: [insert information];
(f) We are not participating, as Bidders, in more than one Bid in this bidding process, other than alternative offers in accordance with the Bidding Documents;
(g) Our firm, its affiliates or subsidiaries, including any subcontractors or suppliers for any part of the Contract, has not been declared ineligible by the Funding Source;
(h) We understand that this Bid, together with your written acceptance thereof included in your notification of award, shall constitute a binding contract between us, until a formal Contract is prepared and executed; and
(i) We understand that you are not bound to accept the Lowest Evaluated Bid or any other Bid that you may receive.
1 If ADB, JICA and WB funded projects, use IFB.
141
Name:
In the capacity of:
Signed:
Duly authorized to sign the Bid for and on behalf of:
Date: ___________
142
Form of Contract Agreement
THIS AGREEMENT, made this [insert date] day of [insert month], [insert year] between [name and address of PROCURING ENTITY] (hereinafter called the“Entity”) and [name and address of Contractor] (hereinafter called the “Contractor”).
WHEREAS, the Entity is desirous that the Contractor execute [name and identification number of contract] (hereinafter called “the Works”) and the Entity has accepted the Bid for [insert the amount in specified currency in numbers and words] by the Contractor for the execution and completion of such Works and the remedying of any defects therein.
NOW THIS AGREEMENT WITNESSETH AS FOLLOWS:
1. In this Agreement, words and expressions shall have the same meanings as are respectively assigned to them in the Conditions of Contract hereinafter referred to.
2. The following documents shall be attached, deemed to form, and be read and construed as part of this Agreement, to wit:
(a) General and Special Conditions of Contract;
(b) Drawings/Plans;
(c) Specifications;
(d) Invitation to Apply for Eligibility and to Bid;
(e) Instructions to Bidders;
(f) Bid Data Sheet;
(g) Addenda and/or Supplemental/Bid Bulletins, if any;
(h) Bid form, including all the documents/statements contained in the Bidder’s bidding envelopes, as annexes;
(k) Credit line issued by a licensed bank, if any;
(l) Notice of Award of Contract and the Bidder’s conforme thereto;
(m) Other contract documents that may be required by existing laws and/or the Entity.
3. In consideration of the payments to be made by the Entity to the Contractor as hereinafter mentioned, the Contractor hereby covenants with the Entity to execute and complete the Works and remedy any defects therein in conformity with the provisions of this Contract in all respects.
4. The Entity hereby covenants to pay the Contractor in consideration of the execution and completion of the Works and the remedying of defects wherein, the Contract Price or such other sum as may become payable under the provisions of this Contract at the times and in the manner prescribed by this Contract.
143
IN WITNESS whereof the parties thereto have caused this Agreement to be executed the day and year first before written.
Signed, sealed, delivered by the (for the Entity)
Signed, sealed, delivered by the (for the Contractor).
Binding Signature of PROCURING ENTITY
________________________________________________
Binding Signature of Contractor
_____________________________________________
[Addendum showing the corrections, if any, made during the Bid evaluation should be attached with this agreement]
144
Omnibus Sworn Statement
REPUBLIC OF THE PHILIPPINES ) CITY/MUNICIPALITY OF ______ ) S.S.
A F F I D A V I T
I, [Name of Affiant], of legal age, [Civil Status], [Nationality], and residing at [Address of Affiant], after having been duly sworn in accordance with law, do hereby depose and state that:
1. Select one, delete the other: If a sole proprietorship: I am the sole proprietor of [Name of Bidder] with office address at [address of Bidder]; If a partnership, corporation, cooperative, or joint venture: I am the duly authorized and designated representative of [Name of Bidder] with office address at [address of Bidder];
2. Select one, delete the other: If a sole proprietorship: As the owner and sole proprietor of [Name of Bidder], I have full power and authority to do, execute and perform any and all acts necessary to represent it in the bidding for [Name of the Project] of the [Name of the Procuring Entity]; If a partnership, corporation, cooperative, or joint venture: I am granted full power and authority to do, execute and perform any and all acts necessary and/or to represent the [Name of Bidder] in the bidding as shown in the attached [state title of attached document showing proof of authorization (e.g., duly notarized Secretary’s Certificate issued by the corporation or the members of the joint venture)];
3. [Name of Bidder] is not “blacklisted” or barred from bidding by the Government of the Philippines or any of its agencies, offices, corporations, or Local Government Units, foreign government/foreign or international financing institution whose blacklisting rules have been recognized by the Government Procurement Policy Board;
4. Each of the documents submitted in satisfaction of the bidding requirements is an authentic copy of the original, complete, and all statements and information provided therein are true and correct;
5. [Name of Bidder] is authorizing the Head of the Procuring Entity or its duly authorized representative(s) to verify all the documents submitted;
6. Select one, delete the rest:
145
If a sole proprietorship: I am not related to the Head of the Procuring Entity, members of the Bids and Awards Committee (BAC), the Technical Working Group, and the BAC Secretariat, the head of the Project Management Office or the end-user unit, and the project consultants by consanguinity or affinity up to the third civil degree; If a partnership or cooperative: None of the officers and members of [Name of Bidder] is related to the Head of the Procuring Entity, members of the Bids and Awards Committee (BAC), the Technical Working Group, and the BAC Secretariat, the head of the Project Management Office or the end-user unit, and the project consultants by consanguinity or affinity up to the third civil degree; If a corporation or joint venture: None of the officers, directors, and controlling stockholders of [Name of Bidder] is related to the Head of the Procuring Entity, members of the Bids and Awards Committee (BAC), the Technical Working Group, and the BAC Secretariat, the head of the Project Management Office or the end-user unit, and the project consultants by consanguinity or affinity up to the third civil degree;
7. [Name of Bidder] complies with existing labor laws and standards; and
8. [Name of Bidder] is aware of and has undertaken the following responsibilities as a Bidder: a) Carefully examine all of the Bidding Documents;
b) Acknowledge all conditions, local or otherwise, affecting the implementation of the
Contract;
c) Made an estimate of the facilities available and needed for the contract to be bid, if any; and
d) Inquire or secure Supplemental/Bid Bulletin(s) issued for the [Name of the Project].
9. [Name of Bidder] did not give or pay directly or indirectly, any commission, amount, fee, or any form of consideration, pecuniary or otherwise, to any person or official, personnel or representative of the government in relation to any procurement project or activity.
IN WITNESS WHEREOF, I have hereunto set my hand this __ day of ___, 20__ at ____________,
* This form will not apply for WB funded projects.
146
Bid-Securing Declaration
REPUBLIC OF THE PHILIPPINES ) CITY OF __________________ ) S.S. x-----------------------------------------------x BID-SECURING DECLARATION
Invitation to Bid/Request for Expression of Interest No.6 : [Insert reference number]
To: [Insert name and address of the Procuring Entity]
I/We7, the undersigned, declare that:
1. I/We understand that, according to your conditions, bids must be supported by a Bid
Security, which may be in the form of a Bid-Securing Declaration.
2. I/We accept that: (a) I/we will be automatically disqualified from bidding for any contract with any procuring entity for a period of two (2) years upon receipt of your Blacklisting Order; and, (b) I/we will pay the applicable fine provided under Section 6
of the Guidelines on the Use of Bid Securing Declaration8, if I/we have committed
any of the following actions:
i. Withdrawn my/our Bid during the period of bid validity required in the Bidding Documents; or
ii. Fail of refuse to accept the award and enter into contract or perform any and all acts necessary to the execution of the Contract, in accordance with the Bidding Documents after having been notified of your acceptance of our Bid during the period of bid validity.
3. I/We understand that this Bid-Securing Declaration shall cease to be valid on the
following circumstances:
(a) Upon expiration of the bid validity period, or any extension thereof pursuant to your request;
(b) I am/we are declared ineligible or post-disqualified upon receipt of your notice to such effect, and (i) I/we failed to timely file a request for reconsideration or (ii) I/we filed a waiver to avail of said right;
_________________________ 6 Select one and delete the other.
7 Select one and delete the other. Adopt same instruction for similar terms throughout the document.
8 Issued by the GPPB through GPPB Resolution 03-2012 on 27 January 2012
147
(c) I am/we are declared as the bidder with the Lowest Calculated and
Responsive Bid/Highest Rated and Responsive Bid9, and I/we have furnished
the performance security and signed the Contract.
IN WITNESS WHEREOF, I/We have hereunto set my/our hand/s this _____ day of [month] [year] at [place of execution].
[Insert NAME OF BIDDER’S AUTHORIZED REPRESENTATIVE] [Insert signatory’s legal capacity]
Affiant
SUBSCRIBED AND SWORN to before me this _____ day of [month] [year] at
[place of execution], Philippines. Affiant’s is/are personally known to me and was/were identified by me through competent evidence of identity as defined in the 2004 Rules on Notarial Practice (A.M. No. 02-8-13-SC). Affiant/s exhibited to me his/her [insert type of government identification card used], with his/her photograph and signature appearing thereon, with no. _________ and his/her Community Tax Certificate No. ______________ issued on ______________ at ___________.
Witness my hand and seal this ________ day of [month] [year].
